diff options
Diffstat (limited to 'llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp index fbbe29cfe5b..bd58e81bc91 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp @@ -1821,7 +1821,13 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) { // If there is a stackrestore below this one, remove this one. if (II->getIntrinsicID() == Intrinsic::stackrestore) return eraseInstFromFunction(CI); - // Otherwise, ignore the intrinsic. + + // Bail if we cross over an intrinsic with side effects, such as + // llvm.stacksave, llvm.read_register, or llvm.setjmp. + if (II->mayHaveSideEffects()) { + CannotRemove = true; + break; + } } else { // If we found a non-intrinsic call, we can't remove the stack // restore. |
